¹ National Astronomical Observatories, CAS, 20A Datun Road, Chaoyang District, 100012 Beijing, China
² Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany
³ Graduate University of the Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, 100049 Beijing, China
⁴ Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
⁵ Universität Sternwarte München, Scheinerstrasse 1, D-81679 München, Germany
⁶ Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
⁷ Department of Physics and Astronomy, CSCE (Center for the Study of Cosmic Evolution), and JINA (Joint Institute for Nuclear Astrophysics), Michigan State University, East Lansing, MI 48824
⁸ Lick Observatory/University of California, Santa Cruz, CA 95060
⁹ Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510-5011
¹⁰ Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180
¹¹ Department of Physics and Astronomy, Texas Tech University, Lubbock, TX 79409
¹² Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
¹³ Department of Astronomy and Astrophysics, Pennsylvania State University, 504 Davey Laboratory, University Park, PA 16802